Vol. XXV] ENTOMOLOGICAL NEWS 441 



? . Length 3.25 mm., agrees with the male in all but sexual charac- 

 ters. 



Described from two males and two females, taken at Avon, 

 New Jersey, September 27, 1908, by Mr. H. S. Harbeck. 



This species comes close to M. nigripes Loew, but has white 

 bristles above the fore coxae; the halteres and cilia of the 

 tegulae are brownish, and the fore coxae have minute but dis- 

 tinct white pubescence on their anterior surfaces, and pale 

 bristles at their tips ; while nigripes has black bristles at the 

 tip of the fore coxae which are otherwise bare, the bristles 

 above them are also black ; the halteres and cilia of the tegulae 

 are whitish in nigripes, and the first joint of the hind tarsi is 

 shorter in proportion than in this species. 



Medeterus lobatus n. sp. (Plate XVIII, Fig. 11). 



$ . Length 2.3 mm. Proboscis and palpi small, brown ; face rather 

 wide, metallic green ; front blue, narrowly green along the orbits ; 

 antennae black, first and second joints of about equal length, third 

 joint about half as long as the second and rounded at tip, pubescent; 

 arista apical, about as long as the height of the head, pubescent; or- 

 bital cilia black above, pale below ; the bristle at the upper corner of 

 the eye large, curved forward. 



Thorax and abdomen metallic green with coppery reflections, and 

 some bluish reflections on the pleurae and forepart of the dorsum; 

 thorax thinly gray pollinose ; acrostichal bristles small, in two rows ; 

 humeral bristle large ; three dorsocentral, a posthumeral, one noto- 

 pleural, a presutural, and a postalar bristle, all black and rather large ; 

 a small yellowish bristle above the fore coxae ; scutellum yellow below 

 with four large bristles, the outer pair the smaller. 



Hairs of the abdomen pale; hypopygium long, black, the basal part 

 somewhat metallic, the outer part opaque, appendages rather long, yel- 

 low. 



Fore and middle coxae metallic green on their front surfaces with 

 yellow tips; hind coxae green at base; all the hairs and bristles of the 

 coxae pale, including the bristle on the outer surface of the hind 

 coxae; legs yellow; tips of the tarsi scarcely darkened; hind femora 

 with about five slender bristles near the base on the upper edge, and 

 a row of four stouter bristles on the outer surface towards the tip ; 

 hind tibiae with two bristles at basal third and one preapical bristle, 

 all on the upper surface, also a row of yellow hairs on top which are 

 longer towards the tip ; middle tibiae with two bristles at basal third ; 

 fore tarsi longer than their tibiae, the second joint slightly enlarged. 



